It adopts digital analog to realize sound signal transmission, with high fidelity, high signal-to-noise ratio, and no sound delay. Use unique novel anti-whistle unidirectional high sensitivity condenser microphone core, so that the voice session master almost perfect all-metal junction structure design, dignified appearance; attendance units using plastic material with a novel appearance design, built The antenna is beautiful and decent. Independently developed data communication algorithm for conference applications, so that within the signal range, the system response speed is not affected by the number of non-attendance units.